This clip is a good demonstration of the Musician Proximity Effect (MPE), where musicians who have plenty of room onstage periodically move closer to one another, intensifying their facial expressions and deriving more power to Rock from temporary nearness to one of their bandmates.
The Effect is most powerful when two players, usually guitarists and/or bassists, actually lean against one another back to back, shoulder to shoulder being slightly less powerful. Rocking while simultaneously being involved in male-on-male physical contact is tricky but achievable with the introduction of varying amounts of humor and/or irony.
The increased ability to Rock provided by the MPE lasts even after the musicians disengage, though it is not permanent and may need to be replenished by additional bouts of proximity.
The attempted use of the Effect by more than two musicians at a time, or by direct instrument-to-instrument contact, (cf. Blue Oyster Cult) is risky and not advised or endorsed by Rock Town Hall.